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Conflicts:
	src/bin/d2/Makefile.am
	src/bin/d2/d2_messages.mes
	src/bin/d2/tests/Makefile.am

This change added in response to a "make distcheck" failute on one
of the build systems.

These *.log and *.trs are created in all the tests/ directories when
gtest unittests are run with automake 1.13.4.

See: http://www.gnu.org/software/automake/manual/automake.html#Parallel-Test-Harness

Only OSX uses ".dylib" as a suffix for shared libraries.  Adjust
configure.ac so that the operating system can be better determined,
and ensure the hooks tests use the correct suffic for the test shared
libraries.

The hooks system can only load shared libraries, even if BIND 10 is
linked statically.

Absence of "libdl" on BSD systems required an addition to configure.ac
to check its presence.  Problems with converting "pointer to object"
to "pointer to void*" via reinterpret_cast on Solaris required an
extension to the Pointer_converter class.

When reviewing this commit, it would be better to review it visually
rather than going through the source changes one by one.

This is so that auto-layout is done fully (and looks better than before,
and more importantly, doesn't hang PlantUML in some extreme cases due to
incorrect syntax). The update was suggested by PlantUML developers.

In particular, added a doUpdate version which supports TSIG. It is also
possible to specify Transport layer protocol preferred.

This reduces the risk of someone taking a copy and being left with
a "dangling pointer" to a callout manager.

When logger initialization was disabled for a unit test, a few NULL pointer
assertions came up. This was because, some module commands were executed
without arguments (NULL pointer objects). NULL pointers were not checked
before logging arguments. This led to assertions. NULL pointers are now
checked and "(no arg)" string is logged if present.

Receiving notifications in python

caused by merge of trac3007.